Chuck



(No Model.) v 2 Sheets-Sheet 1.

T. E. CHERRY.

CHUCK.

I No. 548,773.

Patentedoet. 29, l1895.

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ANnREw EGRANAM. PHDTOumaWAsHI NGTON. D C

` i UNITED STATES :PATENT OFFICE,

THOMAS E. CHERRY, OF BATH, MAINE.

CHUCK.

sPncIFIcA'rroNrorming para of Letters Patent No. 548,773, dated october2e, 1895. Application iiled October 30, 1894:'. Serial No. 522,411. (Nomodel.)

Bath, in thercounty of Sagadahoc andState of Maine, have invented a newand. Improved Chuck, of which the following is afull, clear,

and exact description.

My invention relates to improvements in lathe-chucks, and the object ofmy invention is to produce a very simple and substantial chuckwhich maybe applied to an ordinary lathe-spindle, which has the usual arrangeinsuch a way that the jaws may be very quickly adjusted and firmlyfastened, and which has the jaws and mechanism arranged so thatface-plate work-such as sheaves,-

bushings, gears, &c.-may be very advantageously held.

To these ends my invention consists of certain features of constructionand combinations of parts, which will Vbe hereinafter described andclaimed.

Reference is to be had tothe accompanying drawings, forming a part ofthis specification, in which similar figures of reference indicatecorresponding parts in all the views.

Figure 1 is a broken sectional elevation on the line 1 1 of Fig. 2 of myimproved chuck, showing the back side thereof. Fig. 2 isa centrallongitudinal section on the line 2 2 of Fig. 1. Fig. 3 is across-section on the line3 3 of Fig. 2. Fig. 4 is adetail section on theline 4 4 of Fig. 1 and shows the arrangement of one of the sliding jawsand the lever mechanism for moving it, and Fig. 5 is a broken face viewof one of the jaws and of the adjacent portion of the chuck.

The chuck-body 10 is of the usual circular shape, and it is providedwith a central sleeve or hub 11, which is counterbored and screwed tothe collar 12, which is fastened rigidly to the ordinary spindle 13-ofthe lathe. The

lathe has also the usual arrangement of ra-y dial jaws 14, having thecustomary notched faces, but the jaws are hung in a novel man-V ner, sothat they maybe quickly worked and firmly clamped.

The jaws 14 slide in radial slots 15 in the chuck-body 10, and each jawhas a back plate 16 of steelwhich is widened near the center, as shownat 17 in Fig. 4, and this widened porn 11 andncollar 12, and there isation enters corresponding grooves in the sidewalls of the slotH 15,' so`as to prevent the disv placement of the jaw. The slide-plate 1G has atits outer end a boss 18, which enters a hole inthe jaw and is fastenedto the jaw by a key 19, andthe jaw and slide-plate'are also heldtogether by a screw 20.

In the back of each slide-plate 16 is a notch 21 to receive a tooth orlug 22 on a lever 23, which is fulcrumed on a pin 24, held in ribs 25 onthe back of the chuck-body 10, and the inner end ofthe lever contactswith a gib 26,

which lies parallel with the spindle 13 and has a turned-upretaining-lug 27, which enters a groove 28 in the collar 29, which willbe more specifically described below. The gib 26 lies on a wedge 30,which is longitudinally movable in a groove 31 in the sleeve or hub Y Ygroove, wedge, gibfand lever foreach jaw 14. d

It will be seen that when the wedges 30 are drawn backward they willmove outward the gibs 26,"which, acting on the levers 23, tilt thelevers on their fulcru ms and force in the jaws 14, and when the wedgesare pushed forward the reverse action takes place and the jaws arereleased. To enable the wedges to be powerfully moved and firmly heldthey are provided with threaded heads 33, which engage the threads onthe inner edge of a ring 32, which connects by bolts 34 with the collar29, and to enable the connection between the ring and collar to beeasily made the collar is providedwith a connterbored annular groove 35,which is widened at one point, as shown at 36 in Fig. 3, to enable theheads 37 of the bolts 34 to enter the groove 35 and be properlyadjusted, and after the heads are so Vadj usted the bolts may betightened up and the ring 32 and collar 29 held very firmly together.The ring 32 is preferably provided with holes 38 to receive awrench,'spanner, or other implement, so that the ring may be turned byit, if desired.

In adjusting the chuck the material Vto be held in the jaws is placed inposition, and by slipping the collar comprising the ring 32 and collar29 backward the wedges 30 are simultaneously pulled rearward and actingon the gibs 26`and levers 23 force the jaws 14 inward, so as to clampthe work, and-then by turning the aforesaid collar the faces of thewedges are IOO acted onand ythefwedges pulled vmore rmly rearward, andthus consequently-clamping the jaws upon the Work which they hold.

It will be noticed that the ring 32 vand co1- lar 29 form practically asingle collar and are made in two pieces lfor convenience; :butx in theclaims I shall refer to the two as a collar Having thus described myinvention, I? claim as new and desire to secure by Letters Patent- 1. Achuck, comprising'abodyhaving acen f trai sleeve with externalguidegroovestherein, sliding jaws on the chuck body, levers on the backof the chuck to operate the jaws, wedges held in lthe guide :groovesftojengagegl the levers, and a screw collar to actuatef"the wedges,substantially as described.

2. A chuck, comprisingabody portionfhav ing a v.central hub with`longitudinal guidey grooves therein, jawssliding 'on Athe @chuck face,levers fulcrumedzon the back of '-thel chuck and operatively,connected-with ythea jaws to slide them, wedges held inithe guide-llgrooves to engage the levers,t'hewedges'hav 3 ing lthreaded endsthereon, andl are'volublel -collaron the chuck sleeve,.the M'collarbeingi threaded to engage the heads lotthe'l-wedges,`

substantially as described.

3. A.chuck,.comprisingabody travi-nga cenlg trai hubor lsleeve withlongitudinal guidel grooves therein, j awsislid'ableon Lthe .j face 'ofithe chuck, levers fulcrumed :on vthe back of 'the chuck and operativelyconnectedawithft-hel` sta-ntiallyas described.

5.-.A ,chuck comprising a body, movable jaws, a rotatively mounted screwthreaded ring and wedges connected to said jaws and havingscrew-threaded portions to be-engaged 'by the screw threads of said-ring, substantia'lly as set forth.

'6. A-chuck comprising a body, movable jaws, arotatively mounted screwthreaded ring, and wedges adj ustablyconne'ctedto said j awsand providedwithfscrcw threaded portions 'tobeengagedbythe screw Athreads of vvsaid.ring, substantially as setforth.

' 7. A #chuckcomprising a body, movable jaws, a ycollar ha-vingav'recess, a rotatively mounted screwfthreaded ring, Wedges having screwlthreaded portions tofbe engaged bythe screwthreads "ofsaid ringnd gibshaving yinclined faces engaged Vby the wedges, `said gibsbeingconnectedtothe jaws and provided with-projections to vengage the recess in thecollar, -substantially as set forth.

vTHOMAS E. CHERRY. lWflitnesses:

f A. B. Domaine, F. yW. WEEKs

